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#1
02-19-2007, 09:48 PM
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Will a 300d alternator fit a 240d?
The 240d my son is driving is not charging the battery. I'm going to drive to Columbus tomorrow to help him out. I have an extra alternator off of a 617. Are there any differences? FWIW he already tried replacing the battery.
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a few mb diesels 
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#2
02-19-2007, 09:58 PM
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I am pretty sure they are the same, or at least bolt up. i think the 240 has a 55 amp and the 300 has a 65 amp, but the are the same body.
__________________
1984 123.193 372,xxx miles, room for Seven. 1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.
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#3
02-19-2007, 11:28 PM
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You have the double-belt vs. single-belt issue if the alternator is from a turbo engine. I am not absolutely sure, but I expect this means the one belt on a 240D will not ride properly in either of the two pulleys on a 300D alternator. The alignment will probably be off, and I think they use different belt sizes.
Ken300D
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-------------------------- 1982 300D at 351K miles 1984 300SD at 217K miles 1987 300D at 370K miles
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#4
02-20-2007, 05:36 AM
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you should be able to change the pulleys out.
the single pulley is what you want on a 240. btw the douple pulleys take a slightly narrower belt than the single pulleys and if you put in the narrow belt it will slip. this was a real source of aggrivation because we didn't know it and had a charging problem that we couldn't solve for a couple of years. my indie would order belts for my na 300d motor from the book for an 83 300d (which was turbo and the double belt system) and on the single pulley system of the na 300 it was too narrow. tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#5
02-20-2007, 08:04 AM
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alternator swap
Thanks everyone. Hopefully I'll be able to swap the pulleys.
__________________
a few mb diesels
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#6
02-20-2007, 12:55 PM
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If you cant switch pulley's yourself, take it into a locally owned repair shop- most of those places feel bad even charging for something so quick and simple, but it may cost$5-$10.
__________________
1984 123.193 372,xxx miles, room for Seven. 1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.
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